[amitkumar171]

Hi Amit,

To display values on the KMotionCNC Face you can use the KMotionCNC Screen Editor. See the Screen Editor description here:
KMotionCNC Screen Editor - Dynomotion

#1 Use the KMotionCNC Screen Editor to make a Screen Script with a control of DROLabel Style with an associated persist variable number.

#2 Write KFLOP C Code to format the value you wish to display into a string using sprintf and associate the string with the persist variable number that matches the control on the screen.

See the example in this video that adds 2 numbers and displays the result on the screen in a DROLabel. Here is a video tutorial (start at the 13 minute mark)

https://youtu.be/uQWDttzKuDA?t=13m44s

HTH
Regards

Hi, Tom

I tried above method explained by you, But it is not showing the temperature on KmotionCNC Screen .

Please help me in building that screen script file for printing nozzle and bed temperature on kmotion cnc screen.


Waiting for your kind reply.

Thank You

[TomKerekes]

Hi Amit,

Please tell us what you understood and what you tried to do. Post your Screen Script and the C Code that writes the temperature to the Screen.

Regards

[amitkumar171]

Hi Amit,

Please tell us what you understood and what you tried to do. Post your Screen Script and the C Code that writes the temperature to the Screen.

Regards

Hi Tom,

Thanks for your reply,

I want to display two DRO labels on KmotionCNC screen.

How to proceed with that i tried doing it, but it is showing same value for both DRO. It should be different for Both DROlabel.


Waiting for your kind reply.

[TomKerekes]

Hi Amit,

Please show us your Screen Script and the C Code that writes the temperature to the Screen.

Regards

[amitkumar171]

Hi Amit,

Please show us your Screen Script and the C Code that writes the temperature to the Screen.

Regards

Hi tom,

That showing temperature to KmotionCNC screen is done.

Thanks for your support. Now only U axis Jog buttons is not on KmotionCNC screen.

How to make jog buttons for U axis similar to X, Y, Z, A, B, C axis.

waiting for your kind reply.


THANK YOU

[TomKerekes]

Hi Amit,

How to make jog buttons for U axis similar to X, Y, Z, A, B, C axis.

You asked this question last year. See:
https://www.cnczone.com/forums/dynom...ml#post2094854

Please respond to our suggestions there.

Regards

[amitkumar171]

Hi Amit/Vignesh,

#3 Set increasing Set Points (0 - 2047) and create a Table of commanded ADC values vs Measured Temperatures. Be careful not to go to too high of a temperature and burn up your nozzle. You must wait for the temperature to stabilize after each change of set point before taking the temperature reading.


HTH
Regards

Hi tom,

I have a doubt, How to calculate maximum ADC counts to input in your suggestion above mentioned. When i am using 12V power supply, and SEMITEC 104 GT2 Thermistor. ?

What will be the max ADC counts that i can put in MDI to measure minimum and maximum temperature range.


Waiting for your kind reply

[TomKerekes]

Hi Amit,

I don't really understand what you are asking. The ADC min-max range id 0-4097. Increase/decrease ADC setpoint gradually to test the range of temperatures you need.

I Google searched for your sensor and found this:

Attachment 394448


I believe this is the appropriate resistance formula

Attachment 394450

From KNozz Manual:
ADC = 4095 x 10K / (10K + R)

Plotting
Attachment 394498

What temperature range are you expecting? What temperatures for ADC settings do you observe?

If my math and plot is correct resolution will be poor over 150C.

I've attached the Excel spreadsheet.

Regards

[amitkumar171]

Hi Amit,

What temperature range are you expecting? What temperatures for ADC settings do you observe?

If my math and plot is correct resolution will be poor over 150C.

I've attached the Excel spreadsheet.

Regards

Hi Tom,

Thanks for your reply.

I am expecting temperature range from 0-400 degree C.

And i am getting temperature from 25 degree C to 287 degree C.

After that it is not going forward , how to configure Knozz to reach that such temperature range. And how to increase resolution for thermistor calibration. And What voltage and current powersupply should I use to reach such temperature (0-400C). What ADC count is required to reach such temperature range. (0-400C).

Waiting for your kind reply.

Thank You

[TomKerekes]

Hi Amit,

Note: there was a bug in my last post with ADC range of the plot being 2047 instead of 4095 counts. It should be now corrected.

I am expecting temperature range from 0-400 degree C.

That seems excessive. That sensor is only rated to 300C max. Do you really want or need this?

And i am getting temperature from 25 degree C to 287 degree C.

After that it is not going forward , how to configure Knozz to reach that such temperature range.

I don't understand what you are saying. Are you measuring actual temperature with a thermometer? If you set the setpoint to 4096 ADC counts then the heater should stay on 100% and there should be no limit to the Temperature by KNozz.

And What voltage and current powersupply should I use to reach such temperature (0-400C).

That has to do with your system and the Nozzle heater.

What ADC count is required to reach such temperature range. (0-400C)

4096 would apply power 100% of the time.

And how to increase resolution for thermistor calibration

To get better resolution at such high temperature you could switch to higher resistance sensor such as the 105GT2. Or you could reduce the 10K reference resistor on KNozz by placing a 1K ohm resistor in parallel with the on-board 10K ohm resistor (connect from the Thermistor to GND). That should result in a plot like this:

Attachment 394502

The resolution at 300C is ~ 1/4 degree C. See also the attached spreadsheet. Note the curve fit is now made over more of the high range and provides a better fit of the high range.

Regards

[amitkumar171]

Hi Tom,

That seems excessive. That sensor is only rated to 300C max. Do you really want or need this?

Yes i need this.

I don't understand what you are saying. Are you measuring actual temperature with a thermometer?

Yes i am measuring the actual temperature with thermometer

Regards[/QUOTE]

I tried the curve fitting method also but the curve i want to fit is 6th order polynomial so in KnozzMcodeTemp file what changes are required. When i am inputing 6th order polynomial in mcode file i am getting negative counts and negative temperature. How to correct this ? or implement 6th order inverse polynomial to solve ADCtoTemp() function inside that mcode file for 6th order polynomial equation.

Waiting for your kind reply

Thank You

[TomKerekes]

Hi Amit,

I tried the curve fitting method also but the curve i want to fit is 6th order polynomial so in KnozzMcodeTemp file what changes are required.

Change:

// function to convert Temp C to ADC counts
float TempToADC(float T)
{
    return  ((-0.000837 * T + 0.170202) * T + 4.565045) * T + 78.452228;  // 3rd order polynomial
}

To:

// function to convert Temp C to ADC counts
float TempToADC(float T)
{
    #define c6 0.0000 // 6th order coefficients
    #define c5 0.0000
    #define c4 0.0000
    #define c3 -0.000837
    #define c2 0.170202
    #define c1 4.565045
    #define c0 78.452228
    return  (((((c6*T+c5)*T+c4)*T+c3)*T+c2)*T+c1)*T+c0;  // 6rd order polynomial
}

When i am inputing 6th order polynomial in mcode file i am getting negative counts and negative temperature. How to correct this ?

You would need to show us what you did.

or implement 6th order inverse polynomial to solve ADCtoTemp() function inside that mcode file for 6th order polynomial equation.

The numerical inverse solution should still work with a 6th order equation if it is well behaved. You might need to change the initial guesses to be over your range. change:

float A, T, T0 = 0.0, T1 = 100.0; // initial guess 0 and 1

to

float A, T, T0 =50.0, T1 = 400.0; // initial guess 0 and 1


In cases like this I always remember John von Neumann famously said:

With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.

HTH
Regards

[amitkumar171]

Hi Amit,

Change:

// function to convert Temp C to ADC counts
float TempToADC(float T)
{
    return  ((-0.000837 * T + 0.170202) * T + 4.565045) * T + 78.452228;  // 3rd order polynomial
}

To:

// function to convert Temp C to ADC counts
float TempToADC(float T)
{
    #define c6 0.0000 // 6th order coefficients
    #define c5 0.0000
    #define c4 0.0000
    #define c3 -0.000837
    #define c2 0.170202
    #define c1 4.565045
    #define c0 78.452228
    return  (((((c6*T+c5)*T+c4)*T+c3)*T+c2)*T+c1)*T+c0;  // 6rd order polynomial
}

You would need to show us what you did.


The numerical inverse solution should still work with a 6th order equation if it is well behaved. You might need to change the initial guesses to be over your range. change:

float A, T, T0 = 0.0, T1 = 100.0; // initial guess 0 and 1

to

float A, T, T0 =50.0, T1 = 400.0; // initial guess 0 and 1


In cases like this I always remember John von Neumann famously said:

With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.

HTH
Regards

Hi tom,

I am using Knozz board connected with kflop board.

I have connected thermistor Semitec 104GT2 100K ohm thermistor.

When is set the temperature of 200 degrees using m code i am not getting exact temperature. as you said it is 1degree accurate.

How to make it temperature and ADC count graph value accurate. ?

Or i have studied PID temperature control used by arduino board. Proportional Integrative Derivative (PID) Based temperature control is accurate but it is not available with current Knozz Board.

https://www.eurotherm.com/pid-control-made-easy

Above link explains PID based temperature control.

How to implement PID settings into Knozz Board.

Waiting for positive response.


Thank you

AMIT KUMAR

[TomKerekes]

Hi Amit,

When is set the temperature of 200 degrees using m code i am not getting exact temperature. as you said it is 1degree accurate.

How to make it temperature and ADC count graph value accurate. ?

In my previous email I asked:

To get better resolution at such high temperature you could switch to higher resistance sensor such as the 105GT2. Or you could reduce the 10K reference resistor on KNozz by placing a 1K ohm resistor in parallel with the on-board 10K ohm resistor (connect from the Thermistor to GND).

You never responded. Have you done this?

Regards

[amitkumar171]

Hi Amit,

In my previous email I asked:

To get better resolution at such high temperature you could switch to higher resistance sensor such as the 105GT2. Or you could reduce the 10K reference resistor on KNozz by placing a 1K ohm resistor in parallel with the on-board 10K ohm resistor (connect from the Thermistor to GND).

You never responded. Have you done this?

Regards

Hi tom ,

I tried above method still same problem is happening.

How to solve my problem discussed earlier.


Waiting for your positive response.

[TomKerekes]

Hi Amit,

What did you do? What happens?

Regards

[amitkumar171]

Hi Tom,

Thanks for your reply.

To get better resolution at such high temperature you could switch to higher resistance sensor such as the 105GT2. Or you could reduce the 10K reference resistor on KNozz by placing a 1K ohm resistor in parallel with the on-board 10K ohm resistor (connect from the Thermistor to GND).

You never responded. Have you done this?

Yes i had done this placing 1k ohm in parallel with the on-board 10K ohm resistor. So the total resistance with become 909.09ohm.

And yes i tested using the above setup but still i am getting wrong values in very high temperature.

How do i solve this.

Waiting for your kind reply.

[TomKerekes]

Hi Amit,

Test your hardware. Create a table of ADC counts and actual measured temperature. Post it here.

Regards